Assertion: altar's step | /r/HasProperty | upper platform
Facets:
value: for symbolical reasons
type: CAUSE
value: usually
type: TEMPORAL
Source sentences:
text: The high altar was erected on steps, which for symbolical reasons were usually of an uneven number  three or five, including the upper platform (predella) and the pavement of the sanctuary, thus placing it on a higher level than the body of the church, a practice which is still maintained in our churches.
text: The high altar was erected on steps, which for symbolical reasons were usually of an uneven number—three or five, including the upper platform (predella) and the pavement of the sanctuary, thus placing it on a higher level than the body of the church, a practice which is still maintained in our churches.