Exhibit
31.1
  
 Section
302 Certification of Chief Executive Officer
 
 I,
Matthew Dickerson, certify that:
 
 1. I have
reviewed this annual report on Form 10-K of Tenshon, Inc. f.k.a. Shade Down
Under, Inc.
  2. Based
on my knowledge, this report does not contain any untrue statement of a material
fact or omit to state a material fact necessary to make the statements made, in
light of the circumstances under which such statements were made, not misleading
with respect to the period covered by this report;
  3. Based
on my knowledge, the financial statements, and other financial information
included in this report, fairly present in all material respects the financial
condition, results of operations and cash flows of the registrant as of, and
for, the periods presented in this report;
  4. I am
responsible for establishing and maintaining disclosure controls and procedures
(as defined in Exchange Act Rules 13a–15(e) and 15d–15(e)) and internal control
over financial reporting (as defined in Exchange Act Rules 13a–15(f) and
15d–15(f)) for the registrant and have:
  (a)
Designed such disclosure controls and procedures, or caused such disclosure
controls and procedures to be designed under my supervision, to ensure that
material information relating to the registrant, including its consolidated
subsidiaries, is made known to me by others within those entities, particularly
during the period in which this report is being prepared;
  (b)
Designed such internal control over financial reporting, or caused such internal
control over financial reporting to be designed under our supervision, to
provide reasonable assurance regarding the reliability of financial reporting
and the preparation of financial statements for external purposes in accordance
with generally accepted accounting principles;
  (c)
Evaluated the effectiveness of the registrant's disclosure controls and
procedures and presented in this report my conclusions about the effectiveness
of the disclosure controls and procedures, as of the end of the period covered
by this report based on such evaluation; and
  (d)
Disclosed in this report any change in the registrant's internal control over
financial reporting that occurred during the registrant's most recent fiscal
quarter (the registrant's fourth fiscal quarter in the case of an annual report)
that has materially affected, or is reasonably likely to materially affect, the
registrant's internal control over financial reporting; and
  5. I have
disclosed, based on our most recent evaluation of internal control over
financial reporting, to the registrant's auditors and the audit committee of the
registrant's board of directors (or persons performing the equivalent
functions):
  1
  (a) All
significant deficiencies and material weaknesses in the design or operation of
internal control over financial reporting which are reasonably likely to
adversely affect the registrant's ability to record, process, summarize and
report financial information; and
  (b) Any
fraud, whether or not material, that involves management or other employees who
have a significant role in the registrant's internal control over financial
reporting.
 
 Date:
March 30, 2009
 
 /s/ Matthew
Dickerson
 Matthew
Dickerson
 Chief
Executive Officer and
  2