An oblique projection is a simple type of graphical projection employed for developing pictorial, two-dimensional visuals of a few-dimensional objects: heap up, stack up, pile up - arrange into piles or stacks; "She piled up her guides in my front room" Beside a charred pile of timbers the Abyssinians halted, https://alexisuzbbb.wssblogs.com/32218911/5-simple-techniques-for-pile