Where are all of the pedestals?

Question

Purple time rifts are activated by placing relics on pedestals. So far, I have found three pedestals and completed a set of relics on each of them:

• The two pedestals in the main room of the ship
• The pedestal in the gallery

I've looked everywhere I can think of in my ship and can't find a fourth pedestal. Where is it located? Are there any more pedestals?

Answer 1

I was missing only one pedestal. The four pedestals, including the ones I mentioned in my question, are:

• Two in the main room
• One in the gallery
• In the Alpine Skyway room, there is a door with a picture of a laboratory beaker on it. Just inside this door is a strange purple wall. Use the Dweller mask to get past it and find the final pedestal.