The Abstruse Platform is a unique block added by Botania. It allows players and entities to stand on it, unless they're sneaking, in which case they will fall through the platform. Approaching it from any other side allows entities to go through the block. Mana bursts always travel through it.
The Abstruse Platform can also be camouflaged; right-click the platform with the desired block to camouflage with. The block used to camouflage the platform will stay in the player's hand. To change the camouflage, right-click with another block while looking at the Abstruse Platform.